Telephone wall set.



PATENTED NOV. 19, 1907.

w. w. DEAN. TELEPHONE WALL SET.

APPLICATION FILE-D JUNE 16. 1903.

4 SHEETS-SHEET l.

No. 871,485. PATENTED NOV. 19, 1907. W. W. DEAN.

TELEPHONE WALL'SET.

APPLIOATION FILED JUNE 1a, 1903.

4 sums-sum 2.

1w: NORRIS PETERS co, WASHINGTON. u. c.

Y No. 871,485.

' PATENTED NOV. l9, 1907.

W. W. DEAN.

TELEPHONE WALL SET.

APPLICATION FILED JUNE 15, 1903.

4 SHEETS SHEIlT 8.

PATENTED NOV. 19, 1907.

W. W. DEAN. TELEPHONE WALL SET.

APPLIOATION rum) JUIYIB 16. 1903.

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- UNITED STATES PATENT OFFICE.

WILLIAM'WV. DEAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO KELLOGG SWITCHBOARD&

SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TELEPHONE WALL SET.

Specification of Letters Patent.

Patented Nov. 19, 1907.

-To all whom it may concern:

Be it known that I, I/VILLIAM WV. DEAN, a citizen of the United Statesof America, and resident of Chicago, county of Cook, and State-ofIllinois, have invented a certain new and useful Improvement inTelephone I/Vall Sets, of which. the following is a specification.

My invention relates to improvements in telephone=wall sets for use atsubscribers stations in telephone exchanges, and has for its generalobjects the provision of an apparatus or instrument of the classdescribed that is convenient to manufacture,inspect and repair; that hasfew and simple parts, and that is durable and eflicient as well aspleasingin appearance and inexpensive to manufacture.

One main'object of the invention is to provide' a construction in whichthe working parts of the instrument are inclosed normally but areadapted to be entirely exposed when the cover of the instrument isopened.

Another object is to mount all parts upon stationary rigid members'ofthe instrument so that all connections may be permanent and are notrequired to be completed through hinges or other movable members of theset.

Still: another object is to dispense with condenser bo Xes upon the faceof the b ackboards of the instruments thereby cheapening theconstruction.

To the accomplishment of these objects and suchothers as may hereinafterappear, the invention consists in the novel parts and combinations of.parts hereinafter described and particularly pointed out in the appendedclaims, reference being had to the accompanying drawings forming part ofthis specification'in which the same reference characters are usedthroughout the several views to indicate like parts, and in which Figure1 is a perspective view of a subscribers telephone wall set embodying myimprovements; Fig. 2 is a side view of the lower portion of said set,showing the cover partially dropped down to expose the working parts ofthe set; Fig. 3 is a diagram of the circuits involved in the instrument;Fig. '4 is a detailed view of the bell connections Fig. 5 is afront viewof the working parts of the instrument with the cover broken away; Fig.6 is a plan view of the same parts; Fig. 7

is a side view of the working parts of the wall set with a modifiedarrangement and in which an ordinary polarized bell is included, andFig. 8 is a plan view of said modified set.

The backboard 2 of the instrument is preferably of the form shown inFig. 1, upon the narrowed upper portion of which the transmitter arm 3is mounted in the usual manner and carries the transmitter 4 at.itsfree- Upon the lower widened portion of the end. backboard a cover,consisting of the bracket shaped sides 5, sloping top 6 and the frontplate 7, is hinged to said backboard at the lower points of said sides5, said hinges consisting of the angle pieces 8 secured to the backboardand the straight pieces 9- secured to the inner sides of said bracketshaped sides 5, said pieces being pivotally joined by suitable hingepins 10. A ridge 11 formed in any suitable manner occurs near the loweredge of said sloping top 6 to prevent papers and other material fromslipping off the saidtop plate.

A shelf 12, consisting preferably of a sheet metal plate having anupturnededge 13 by means of which said shelf or plate is secured to thebackboard by means of suitable screws or bolts 14, f0 ms the lowerportion of the receptacle or space in which the said working parts ofthe instrument are inclosed when the cover is in closed position, saidplate, as indicated in Figs. 5 and 6 being of su'llicient width to fitclosely between the bracket sides 5 of the box when it is closed. Thefront edge of the shelf 12 also reaches to the front plate 7 of thecover when the latter is closed. as indicated by dotted lines in Fig. 2,and as shown in full lines in Fig. 7. The cover may be dropped down asindicated in Fig. 2 although in practice it would hang lower than shown,f

to entirely expose the said shelf 12 and associated parts for purposesof inspection and repair and is held. in closed position by means of asuitable clip 15 secured to the inner side of the to late 6 by suitablescrews 16 (see Fig. 2) and liaving an aperture in its upper end throughwhich a screw or bolt 17 may be passed to fasten it to the backboard 2.The bell 18 is mounted upon the upper side of said horizontal plate 12,while its gong 19 is secured to the lower side thereof. The bell in thisinstance is of the vibrating reed tongue type, in which a front plate 20is secured to the said shelf 12 by the legs 21 and carries the frontends of the magnets 22 and their cores as well as the adjustable polepieces 23 of said cores. The bell tongue consists of a reed 24 to whichthe armature pieces 25 are riveted which pieces carry at their free endsa flexible member 26 and upon the lower end of this member the ball orhammer 27 of the tongue is carried. The opposite end'of the tongue issecured in place by a suitable clip 28 riveted to the other end of reed24 and adapted to be removably secured to the upper end of said frontplate 20 by means of suitable screws. The ea end of the magnet coils aresupported upon a suitable back plate 29 supported from the shelf 12 bymeans of the posts 30 and at its upper end a clamping strip 31 serves tosecure in place the permanent magnet 32, the foward end of which extendsinto proximity with the fixed end of the reed tongue. The gong 19 iscarried by a post 33 depending from a bar 34 pivoted at its rear end 36and adjustably secured at its opposite end by means of a bolt 37 passingthrough a slot therein and through the plate 12, this arrangementproviding for adjusting the position of the gong with reference to thehammer or ball of the bell. The terminals 38 o the magnets are connectedby means of preferably insulated conductors with the terminal clips ashereinafter explained. A suitable condenser 39 is secured to the upperside of said. shelf 12 by means ofa clamping strip 40 at the forward endthereof, and another clamping strip 41 at the ear end, suitableterminals 42 being provided for said condenser. The condenser is asusual included in a metallic case to protect it from injury and topermit its convenient handling.

A suitable hook switch serves to change the circuits of the set fromnormal signaling condition to talking condition and vice-versa by theremoval of the receiver from'and its replacement upon the switchhook.This switch comprises a standard 43 secured by suitable screws 44 to thebackboard 2 of the set, and at its forward end is pivoted the switchhook 45. A bunched set of switch springs 46, consisting of a pluralityof superposed leaf springs and insulating strips, are secured togetherto a ledge 47 of said standard at the side of the hook lever by means ofscrews 48. The circuit conductors are adapted to be connected to therear end of these springs while their forward ends are suitably operatedby a lug 49 upon the lever 45 which engages one of the intermediatesprings that extends beyond the ends of the other springs. In addition,a lifting spring 50 is secured at one end by a screw 51 to a downwardlyextending portion of said standard and extends forwardly and is thenbent upwardly and backwardly so that its free end 52 engages beneath asuitable lug upon the lower side of said switch-hook 45. This liftingspring is so adjusted that when the receiver is upon the hook saidspring is overcome and the hook is depressed, and when the receiver isremoved therefrom the spring lifts the hook to change the springs 46from normal'position to talking position. The forward end of the hookpasses through a plate 53, which I term an escutcheon plate, secured tothe backboard by screws 54 and having a slot 55 in its forwardlyextending portion through which the arm of the switch-hook passes and inwhich it vibrates. The outer strip of metal of said escutcheon plate issevered at 56 to permit the hook lever to be sprung into the said slot.A notch 57 is provided in the side 5 of the cover to permit the saidcover to be readily opened and closed without interference from the hooklever, said notch being covered by the escutcheon plate when the coveris closed.

A retardation or other coil 58 is mounted upon the upper side of saidshelf 12 and is held in place by a suitable screw 59. passing into thelower end of its core. The receiver binding posts 60 are mounted uponthe backboard within the inclosure of the cover.

The receiver cord is provided with tips in the usual manner adapted tobe connected with said binding posts 60, said cord being passed throughan aperture 61 in the escutcheon plate, which aperture is preferablyprovided with an insulating bushing to prevent wear upon the covering ofthe receiver cord and in case of such wear to prevent short circuitingthe strands of the cord. 62 in the form of metal clips are secured tothe backboard 2 and the ends of the conductors are adapted to besoldered thereto. Additional clips 63 are arranged to be connected withterminals of the bell coil magnets by means of which, as hereinafterexplained, said magnets may be connected either in parallel or inseries. Other terminals 64 are carried by the backboard and areconnected with the condenser 39. For the sake of clearness theconductors running between these various terminals and clips have beenomitted in Figs. 1, 2, 5 and 6 but in Fig.- 3 I have shown in diagramhow the various parts are connected. These conductors are for the mostpart placed in grooves in the back of the backboard, but they extend inthe form of insulated conductors from the terminals of the instrumentsto suitable apertures through said backboard and communicating with thesaid grooves.

The receiver in Fig. 3 is shown upon the hook so that the circuits arein condition for receiving a call from the central ofiice but arenot incondition for talking. Tracing the circuit therefore from the right handline The line terminals terminal 62, it includes the conductor 65,

ofthe. bell in series and thence to the left hand clip 62.. The pathsfor current through the retardation coil 58 and through the transmitter4 stand normally open at the upper springs 48 of the switch-hook. Whenthe receiver is removed from the hook, the

. path for current through the bell coils is opened and the paths forcurrent through the retardation coil, transmitter and receiver areclosed at the upper springs. It is thought unnecessary to trace thesecircuits in detail.

Fig. 4' indicates the bell clips 63 and shows that by merely connectingthe outer terminals 63. and disconnecting the two inner terminals thebell coils are connected in parallel. This isfor the purpose ofadjusting the retardation of said bell coils to a greater or less extentto approximately attune the bell branches to the frequency of theringing currents.

The bell" shown in this apparatus is, as stated, of the tuned reed type,and is adapted to be operated'only at a definite frequency. It istherefore essential to impress upon the line in which the said bell isplaced ringing current of a fre uency corresponding to such definiterate of actuation of the bell. In order to change the instrument tooperate at a difierent frequency it is only necessary to remove the reedtongue as a whole and apply thereto atongue having a differentcharacteristic rate of operation. This different rate of operation ispreferably obtained by varying the-size of the balls or hammers of thereed.

In Figs; 7 and 8 I mount the whole appa- V ratus on the shelf 12 as isindicated, by extendingthe upper portion 13 of the said shelf at aconsiderable height. It is secured as usual to the backboard by thescrews 14. In this form an ordinary polarized bell 18 is employed inwhich a pair of gongs 19, 19, are adjustably carried upon the lower faceof said shelf 12, while the framework of the bell is mounted upon theupper side, said framework comprising, as usual, a pair of coils 22"operatin ing a bafl at its lower end vibrating between the said gongs 19The armature of this bell is polarized .by a permanent magnet 32 in theusual manner. A condenser 39 is secured in place by suitable clampingstrips 40 and 41. The hook-switch is secured in place upon the portion13 of the shelf 12 although it is apparent that it could be supportedfrom beneath by properly designing the standard of the switch. Only asingle pairof bell terminal clips need be provided. Otherwise thearrangement is substantially the same as in the previous figures andwill not be further described. The circuit arrangement for this deviceneed not differ from that of the former apparatus.

HavingI described my invention what I an ordinary pivoted tongue carry.

claim as new and desire to secure by Letters Patent is I 1.. In atelephone wall set, the combination with a backboard, of a shelf securedthereto, a box-like cover fitting over said shelf and hinged at one edgeto permit it to be opened to expose the shelf and parts thereon exposedupon four sides, said shelf forming one wall of the space inclosed bythe cover when closed, a bell mechanism mounted on the inner side ofsaid shelf and the gong of the hell on the outside of the same, wherebywhen the cover is closed the bell magnets and cooperating parts areinclosed and the gong remains outside, substantially as described.

2. In a telephone .wall set, the combination with a support, of a shelfsecured there to, a box-like cover fitting over said shelf and hinged atits lower edge to permit it to swing down to expose said shelf, saidshelf forming the lower wall or side of the space inclosed by the coverwhen closed, a bell mechanism having its magnets mounted in the upperside of said shelf and its gong on the lower side whereby when the coveris closed the bell magnets and cooperating parts are inclosed and thegong is on the outside, substantially as described.

3. In a telephone wall set, the combination with a support, of a shelfsecured to said support, said shelf consisting of a sheet metal platehavinga portion of its inner edge bent at right angles to form a meansof securing 'the same to the support, a box-like cover fitting over saidshelf and hinged at its lower edge to permit it to swing down to exposesaid shelf, said shelf forming the lower wall of the space inclosed bythe cover when closed, and a bell mechanism having its magnets mountedon the upper side of said shelf and its gong on the lower side wherebywhen the cover is closed the bell magnets and operating parts areinclosed and the gong is on the outside, substantially as described.

4. In a telephone wall box, the combination with a supporting back, of ashelf secured to and projecting from said back and forming a portion ofthe inclosure for the box, telephone apparatus mounted upon said shelf,a cover consisting of a top piece, a front piece and side pieces securedtogether, said cover fitting closely over said shelf to inclose theworkin parts of the set when closed and being )odily removable therefromto expose said parts, whereby said parts are accessible from the front,top and sides, substantially as described.

5. In a telephone wall box, the combination with a supporting back, of ashelf secured to and projecting from said back; working parts of thetelephone upon said shelf, a cover consisting of a top, side pieces .anda front piece, all rigidly secured together; said cover fitting closelyover said shelf to inclose the workin parts of the set sisting of asloping top, bracket-shaped side when closed and being bo ily removableto expose the said parts, whereby said parts are exposed on four sides,said shelf forming the bottom wall of the space so inclosed by thecover, substantially as described.

6. In a telephone wall box, the combination with a supporting back, of ashelf secured to and projecting from said back; a cover consisting of atop, side pieces and a front piece, all rigidly secured together; saidcover fitting closely over said shelf to inclose the working parts ofthe set when closed and being hinged at its lower edge to permit thesame to swing down to expose the said parts, said shelf forming thebottom wall of the space so inclosed by the cover, substantially asdescribed.

7'. In a telephone wall box, the combination with a supporting back, ofa horizontal shelf secured to said back; a cover consisting of a top,side pieces and a front piece, all rigidly secured together and hingedat its lower edge; the sides of said cover fitting closely to the sideedges of said shelf and the front plate fitting the front edge of theshelf when the cover is closed and thereby formingan entirely inclosedspace in which 1 the shelf forms the bottom wall, and working parts ofthe instrument inclosed within said space, substantially as described.

8." In a telephone wall box, the combination with a supporting back, ofa horizontalshelf formed of a sheet metal plate with its inner edgeturned up by means of which it is rigidly secured to the said back saidshelf forming the bottom of the box; a cover consisting of a top, sidepieces and a front piece, all ri idly secured together and hinged at itslower edge said cover fitting closely at the sides to the edge of theshelf and at its front piece to the front edge of the shelf when closed,and working parts of the instrument inclosed within the space surroundedby the cover and shelf, substantially as described.

9. In a telephone wall box, the combination with a supporting back, of aprojecting shelf secured to the back and forming a portion of theinclosure of said box; a cover conpieces and a front plate extendingbetween the inner faces of said bracket sides and engaging the top, allrigidly secured together hinges at the lower points of saidbracketshaped sides to hinge the cover so that 1t may be dropped down toexpose the working parts of the set which are mounted within' the spaceinclosed by the cover and shelf, substantially as described.

10. In a telephone wall box, the combination with a backboard, of asuitably-supported shelf and a cover for said shelf consisting ofcooperating side pieces rigidly se' -cured together, said cover fittingclosely over said shelf to inclose the working parts of the set whenclosed and being bodily removable to expose said parts upon four sides,said shelf forming the bottom wall of the space so inclosed by saidcover, substantially as described.

11. In a telephone wall box, the combination with a suitable backboard,of a suitablysupported shelf and an inclosing cover for said shelfadapted to form with said shelf the exterior walls of the telephone box,said cover being bodily removable from said shelf to expose the workingparts of the telephone upon four sides, substantially as described.

12. Ina telephone wall box, the combination with a supporting back, of ashelf secured to and projecting therefrom and forming a portion of theinclosing wall of said box, a cover'consisting of a sloping top,bracket-shaped side pieces and a front plate extending between the innerfaces of said bracket-shaped sides and engaging the top, all rigidlysecured together, hinges at the lower points of said bracket-shapedsides to pivotally connect the cover so that it may be dropped down toexpose the working parts of the set upon four sides, substantially asdescribed.

Signed by me at Chicago, county of Cook, State of Illinois, this 12thday of June, 1903.

WILLIAM W. DEAN.

Witnesses:

GAZELLE BEDER, ROBERT LEWIS Mans.

